This effect can be enabled if you are the host of the XBox Live game. To enable press 'Start' as host and then hold LB, Left Stick (x2), A, Right Stick (x2), B, Left Stick (x2), X, Right Stick (2), Y.

Use the mic in single player. If you keep the mic plugged in then you can issue voice commands to your team, saves you having to take your finger of the trigger! Whatever Keller says, you say into the mic, the team do it, as if you had pressed the button.

During gameplay open the 'Pause' menu and hold the Left shoulder button and enter the following codes to unlock the corresponding effect.

Increase Ragdoll Strength:
A, A, B, B, X, X, Y, Y, A, B, X, Y.

Unlock 3rd Person View:
Press X, B, X, B, Left Thumbstick, Left Thumbstick, Y, A, Y, A, Right Thumbstick, Right Thumbstick.

Change Bullet Tracers Colour:
Left Thumbstick, Left Thumbstick, A, Right Thumbstick, Right Thumbstick, B, Left Thumbstick, Left Thumbstick, X, Right Thumbstick, Right Thumbstick, Y.

Unlock One Hit Kills Mode:
Left Thumbstick, Right Thumbstick, Left Thumbstick, Right Thumbstick, A, B, Left Thumbstick, Right Thumbstick, Left Thumbstick, Right Thumbstick, X, Y.

Unlock Big Head Mode:
B, X, A, Y, Left Thumbstick, Y, A, X, B, Right Thumbstick.

When you play the Fremont Street level look for a ledge on one of the buildings that has a bottle of Axe cologne. When you shoot the bottle the neon roof of the Fremont Street Experience will change to an animation of a girl in a bikini promoting Axe items. This sequence is then followed by a sequence with outtakes and early animations.

Achieve the following ranks to unlock the correspondng items

Private 2nd Class:
All Starting Equiptment. Sergeant (Tactical Armor):
Raven Recon Armor, Vulture Combat Armor, Falcon Assault Armor.

Sergeant Major (Black Market Armor):
Typhoon Recon Armor, Cyclone Combat Armor, Hurricane Assault Armor.

Major (Military Armor):
Vier Recon Armor, Diamondback Combat Armor, Anaconda Assault Armor.

Corporal (Camo 1):
Desert, Urban, Russian, Guerrilla, Fall, Desert 2

Sergeant First Class (Camo 2):
Flecktarn, Orange, Swedish, War2k5, Alpen, White.

2nd Lieutenant (Camo 3):
Pink, Blue, Woodland, Wasp, Sand, Crimson.

Lt. Colonel (Camo 4):
Yellow Urban, Red Urban, Tiger, Rust, Urban 2, Grey

Elite (Camo 5):
Custom 1, Custom 2, Custom 3

Master Sergeant (Freedom Fighter Weapons):
AK47, Raging Bull, SV98

Private 1st Class (Headgears 1):
Tactical Helm, Balaclava.

Staff Sergeant (Headgears 2 - 3):
Hole Balaclava, Baseball Cap, Breathing Mask.

First Sergeant (Headgears 3):
Bonnie Hat, Beret, Tinted Goggles

1st Lieutenant (Headgears 4):
Half-Face Mask, Reinforced Helm, Tactical Goggles.

Colonel (Headgears 5):
Ballistic Face Mask, Riot Helm, NVGs

Captain (Merc Weapons):
MG36, SPAS12, Deagle

Specialist (Rainbow Weapons):
MP7A1, SIG552, USP40

Successfully complete the following tasks to unlock the corresponding achievements and it's alloted GamerScore.

Basic Training - GamerScore 5:
Achieve the rank of Private 1st Class

Marksman - GamerScore 10:
In any adversarial mode get a total of 100 player kills

Co-op Hunt Novice - GamerScore 10:
With at least one other player complete a Co-operative T-Hunt mission

Co-op Story Novice - GamerScore 10:
With at least one other player complete a Co-operative Story mission

Sniper - GamerScore 15:
In an Online ranked game get 10 kills using a Sniper rifle

Survivor - GamerScore 15:
In a ranked Online game of Survival be the only remaining player

Team Champion - GamerScore 15:
Most kills in a winning online ranked match of Team Sharpshooter

Team Survivalist - GamerScore 15:
Most kills in a winning online ranked match of Team Survival

Master of Ceremonies - GamerScore 15:
Host a 16-player match

Lone Wolf - GamerScore 15:
Most kills in a ranked online Sharpshooter match

Hazmat Specialist - GamerScore 15:
Deposit the canister and kill an enemy canister carrier in the same Retrieval match

Siege Specialist - GamerScore 15:
Leading contributor of kills for the Defenders in a winning Attack & Defend ranked match

Hostage Rescue - GamerScore 15:
In under 5 minutes rescue all hostages in an Attack & Defend mission

Infiltration Specialist - GamerScore 15:
In under 2 minutes recover the Intel in an Attack & Defend mission

Bomb Expert - GamerScore 15:
In an Attack & Defend mission defuse the bomb within 2 minutes

Killer's Spree - GamerScore 20:
5 consecutive player kills without dying

Equipment Specialist - GamerScore 20:
In Single Player Story use all Gadgets at least once

Demolition Expert - GamerScore 20:
Kill 50 players using Explosives only

Officer - GamerScore 20:
Achieve the rank of Lieutenant 2nd Class

Pistoleer - GamerScore 25:
Using only a Pistol Kill 150 terrorists

Tough Hombre - GamerScore 30:
In Single Player Story mode complete Border Town

Street Cleaner - GamerScore 30:
In Single Player Story mode complete Downtown Vegas

Dam Buster - GamerScore 30:
In Single Player Story mode complete Nevada Dam

Hell Hound - GamerScore 30:
In Single Player Story mode complete Dante's Casino

High Climber - GamerScore 30:
In Single Player Story mode Complete Vertigo Spire

High Roller - GamerScore 30:
In Single Player Story mode complete Calypso Casino

True Identity - GamerScore 30:
Used the Xbox Live Vision to create a character with your appearance

Executioner - GamerScore 30:
Oonline or Offline Kill 500 terrorists

Killer's Rampage - GamerScore 30:
10 consecutive player kills without dying

Best of the Best - GamerScore 40:
Achieve the rank of Elite

Vegas Champion - GamerScore 50:
Co-operatively complete the Story mode

Special Operations - GamerScore 50:
Play all maps of every adversarial game mode

Veteran Hunter - GamerScore 50:
On Normal difficulty setting complete all maps of splitscreen Terrorist Hunt

Tour of Duty - GamerScore 60:
Co-operatively complete all Terrorist Hunt missions

Elite Hunter - GamerScore 75:
Complete all maps in splitscreen T-Hunt at Realistic difficulty

Rainbow Six Legend - GamerScore 100:
Complete the Single Player Story mode at Realistic difficulty

Complete the following tasks to get the corresponding EXP. EXP can be earned in both Ranked or Player matches.

Black Market Armor - 139000 EXP:
Typhoon Recon Armor, Cyclone Combat Armor, Hurricane Assault Armor Achieve the rank of Sergeant Major.

Rainbow Weapons - 8400 EXP:
MP7A1, SIG552, USP40
Achieve the rank of Specialist

Camo 1 - 14500 EXP:
Desert, Urban, Russian, Guerrilla, Fall, Desert 2
Achieve the rank of Corporal.

Camo 2 - 56500 EXP:
Flecktarn, Orange, Swedish, War2k5, Alpen, White
Achieve the rank of Sergeant First Class.

Camo 3 - 172000 EXP:
Pink, Blue, Woodland, Wasp, Sand, Crimson
Achieve the rank of 2nd Lieutenant.

Camo 4 - 425000 EXP:
Yellow Urban, Red Urban, Tiger, Rust, Urban 2, Grey
Achieve the rank of Lt. Colonel.

Camo 5 - 675000 EXP:
Custom 1, Custom 2, Custom 3
Achieve the rank of Elite.

Headgears 1 - 3000 EXP:
Tactical Helm, Balaclava
Achieve the rank of Private 1st Class

Headgears 2 - 38500 EXP:
3 Hole Balaclava, Baseball Cap, Breathing Mask
Achieve the rank of Staff Sergeant

Headgears 3 - 109500 EXP:
Bonnie Hat, Beret, Tinted Goggles
Achieve the rank of First Sergeant

Headgears 4 - 214000 EXP:
Half-Face Mask, Reinforced Helm, Tactical Goggles
Achieve the rank of 1st Lieutenant

Headgears 5 - 535000 EXP:
Ballistic Face Mask, Riot Helm, NVGs
Achieve the rank of Colonel

Merc Weapons - 264000 EXP:
MG36, SPAS12, Deagle
Achieve the rank of Captain

Military Armor - 330000 EXP:
Vier Recon Armor, Diamondback Combat Armor, Anaconda Assault Armor
Achieve the rank of Major

Freedom Fighter weapons - 82500 EXP:
AK47, Raging Bull, SV98
Achieve the rank of Master Sergeant

Tactical Armor - 23500 EXP:
Raven Recon Armor, Vulture Combat Armor, Falcon Assault Armor
Achieve the rank of Sergeant